Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 411 AM EDT Sat Apr 25 2020 Valid 12Z Sat Apr 25 2020 - 12Z Mon Apr 27 2020 ...There is an Slight Risk of severe thunderstorms over parts of the Tennessee Valley and parts of the Southern Appalachians... ...Heavy snow for parts of the Northeast... ...Record heat possible in parts of the Southwest and South Florida, March-like temperatures possible in the Northeast and Ohio Valley on Sunday... A storm tracking across the Lower Mississippi Valley and the Tennessee Valley will be responsible for showers and thunderstorms this afternoon and evening. Some thunderstorms could be severe containing damaging winds, large hail, and tornadoes. Some storms may also lead to isolated areas of flash flooding. On the storm's northern flank, periods of rain and spotty thunderstorms over the Middle Mississippi Valley will head east into the Ohio Valley and Lower Great Lakes on Saturday. By Saturday night, a new area of low pressure will begin to develop over the Mid-Atlantic and strengthen off the Mid-Atlantic coast on Sunday. Residents from the eastern Ohio Valley to New England will be in for a wet, dreary, and gusty Sunday with the storm waiting to head out to sea until Monday. Abnormally cold temperatures across Northeast will also set the stage for late season snow in the northern Appalachians. Look for drier conditions to return to the Northeast late in the day on Monday. To the west, a dome of well above normal temperatures will will maintain a stronghold over the Southwest and Great Basin through the weekend and into the start of next week. Forecast highs in the Desert Southwest each day this weekend will at the very least be in the 80s while others surpass the century mark and/or challenge daily record high temps. In fact, parts of southern California are under Heat Advisories through Saturday while Excessive Heat Watches have been issued for the Phoenix metro area on Sunday. In addition, parts of South Florida and the Florida Keys may challenge daily record highs on Saturday. The High Plains will start the weekend on a cool note warmer temperatures will return on Sunday. While the Southwest and some locations of the Intermountain West bask in summer-like temperatures, those from the Mississippi River to the Northeast will contend with below normal temperatures, some of which will range between 10 and 15 degrees below normal. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php